Dumb-bell lipoma of finger digital flexor sheath: Unusual presentation.

Sir,

Lipomas are common benign mesenchymal tumours arising from the adipose tissue predominantly involving the trunk and head and neck region.[12] Lipoma of hand comprises 1% of all lipomas occurs in our body though the exact incidence of finger lipoma not found in the literature. There are few case reports of finger flexor tendon sheath lipoma available, but none of them mentioned about the dumb-bell-shaped presentation of lipoma in finger which presented on the both sides of flexor tendon.[3] Lipoma of the hand and fingers may be divided into 'endovaginal' (origin from the tendon sheath), 'epivaginal' (origin from other subaponeurotic soft tissues) and parosteal (arising from the periosteum).[345] Endovaginal lipomas can be further divided into 'lipoma simplex symmetricum' and 'lipoma arborescens'.

Our patient is 65 years aged female, presented with the complaint of slow-growing swelling in the right ring finger over the period of 10 years. There was no history of pain and reduction strength of the finger grip except for the past 6 months, in which she was feeling the difficulty in flexing the ring finger completely. On examination, a solitary, soft, lobulated swelling of size 4.5 cm × 3 cm × 3 cm extending proximally from the distal palmar crease to the proximal interphalangeal joint crease of the fourth ray. The swelling found to extend dorsally through the third and fourth web spaces [Figure 1]. Swelling was not attached to the skin, and the movements of flexor tendons did not affect the swelling significantly. Complete flexion of the finger was restricted. There was no sensory abnormality in the digit. The patient was having candidiasis infection of the third and fourth web space. Magnetic- resonance imaging showed the confirmed the diagnosis and showed the extent of the lesion [Figure 2].

Figure 1

Lipoma right ring finger, (a) palmar and, (b) dorsal aspect

Figure 2

T1- and T2-weighted magnetic- resonance imaging images showing the lipoma and its extent

The patient was treated with topical antifungals for the candidiasis infection. Under general anaesthesia, tourniquet control and loupe magnification, Brunner's skin incision was made and flaps raised. A lobulated lipoma arising from the flexor tendon sheath extending both ulnar and radial sides (Dumb-bell shaped) of ring finger through the first cruciate pulley (C1) with a communicating segment posterior to the flexor tendons [Figure 3a and b] was noticed. The swelling was extending dorsally displacing the neurovascular bundle on both sides and was dissected and delivered into the wound, safeguarding the neurovascular bundles. Cruciate pulley (C1) was released completely on the both sides, flexor tendons were retracted and the lipoma along with the part of synovial sheath excised [Figure 3c]. Histopathological examination of the specimen confirmed lipoma. Post-operative course was uneventful.

Figure 3

(a) Lipoma seen on the both sides of flexor tendon. (b) Communicating segment of lipoma extends through cruciate pulley posterior to the flexor tendons. (c) Excision of dumb-bell-shaped lipoma along with digital sheath

This case is reported because of its unusual presentation. Careful preoperative and intraoperative assessment is required so as not to miss the intrasynovial communicating segment, which may cause future recurrence if left behind.

Financial support and sponsorship

Department of plastic Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research, Pondicherry, India.

Conflicts of interest

There are no conflicts of interest.